Paper box



April 24, 1934. w s, JACKSON PAPER BOX Filed Oct. 9, 1933 vllflflllilllll Illllllllll! J ATTORNEY Patented Apr. 24, 1934 1,956,124

Nrrso STATES PATENT OFFICE.

PAPER BOX William S. Jackson, Walpole, Mass, assignor to Bird & Son, Inc., East Walpole, Mass, a corporation of Massachusetts Application October 9, 1933, Serial No. 692,842

6 Claims. (01. 229 -34) This invention relates to a paper' box and has the only substantial difference between the covparticularly to do with an improved paper box er and the base being in the relative dimensions or'carton having as the characteristic feature of the respective parts. In Fig. l, is shown the thereof a novel corner construction which repreferred form of flat blank for a box cover, for

5 lieves strain at the corners and by so doing preexample a shoe box cover, having the scoring and 6 vents cracking of the box material at the corner slitting indicated to define a central portion 2 folds. (the inside surface of the box cover being shown) In box construction it has been the common separated by the common double longitudinal practice to make at least the edge portions of the scoring 3, from the side wings 51 which are in m sides of both the base and cover of the box of two turn separated by the scoring 5 from the side layers of cardboard, usually formed by folding an wing flaps 6. Said side wings 4 and side wing extended side portion inwardly at the exposed flaps 6 have attached thereto at the ends thereedge of the cover or base. This double layer side of, extensions 8 and 9 which are separated from strip is usually pasted together, after which the the side wings and side wing flaps respectively 15 double layer is folded on itself at a 90 degree angle by the scoring 10 and 11. The scoring 10 may be to form the corner of the box. I have found that the ordinary double scoring similar to that of 3 the cracking of the outer layer of the corner which and 5, but the scoring 11 preferably comprises has 'so frequently occurred during the corner a single groove or channel of a width approxiforrning folding operation, can be entirely elimimately equal to the distance between the outer 2i? hated by providing that the inner layer of the edges of the scoring 10 and forming a slight conmaterial automatically removes itself from the vexity on the reverse side of the paper as shown inner apex of the angle thereby relieving the at 21. strain which has heretofore occurred through the The extensions 8 and 9 are preferably separated tensile stress initiated through the required bendfor a major portion of their length by theslit 13,

25 ing and stretching of the outer layer around the which extends from the point 12 approximately inner layer. As will appear, I further relieve the midway between the scorings 5 and adjacent the strains incident to the corner forming operation inner scoring 10 as indicated to the point 12a by providing that the two layers of cardboard, some distance back from the edge of the cardalthough pasted together, are at the same time board,the slit 13 being parallel to the scorings 30 free for a limited relative movement. It will be 5. The scoring 14 forms a continuation of the 35 found that the box blank constructed according scoring 5 commencing slightly inside the point 12a to my invention could be bent to an angle of even and running to the edge. 180 without cracking the outer layer. At the ends of the central portion 2, but sepa- In the drawing, Fig. 1 is a plan view of a flat ratedtherefrom by. the scoring 15, are end wings 35 blank for a box cover completely scored and 16, and attached thereto, though separated thereslitted; from by the scoring 17, are the end wing flaps 18,

Fig. 2 is a perspective view of the left-hand said end wings and end wing flaps being separated lower corner of the blank of Fig. 1, somewhat from the extensions 8 by the slits 19 extending enlarged in order to better show the scoring and from between the scorings 3 to the edge as indislitting; I cated in Fig. 2.

Fig. 3 is a plan view showing the blank of Fig. The box cover blank-of Fig. 1 having now been 1 after the longitudinal side edges have been completely scored and slit as described, is then folded over to provide a double thickness of mafed to a pasting machine which applies a strip terial for the side walls; of paste 20 along the marginal edge of both side 5 Fig. 4 is a perspective view of an inside corwing flaps 6 as indicated in Fig. 2. It will be ner, somewhat enlarged, illustrating subsequent noted that due to the concavity of the channel steps in the folding or setting-up of the box; and 11, the paste strip 20 is broken for the width of Fig. 5 is a perspective view of the completed the channel 11, the cardboard at that portion not box corner. coming in contact with the paste applying means.

5 Referring to the drawing in which like refer- After the pasting operation the blank is given a 100 ence numerals represent like parts, Figs. 1-4 inpreliminary folding operation to provide a double clusive, for convenience, illustrate the invention .layer for the side walls. In this operation the with respect to abox cover, but the same explanablank is folded along the lines of the scorings 5 tion and description applies equally well to any and aligned slits 13 so that the two side wing 55 box construction such as the box proper or base, flaps 6 are bent upwardly at right angles (from then downwardly through a total angle 'of 180" so as to overlie in face-to-face contact the side wings 4, the extensions 9 being similarly folded so as to overlie in face-to-face contact the extensions 8 (see Fig. 3). Whatever pressure may be required to adhere the pasted portions 20 is applied during this operation and it willbe noted that the entire marginal portion of the wing flaps 6 will be adhered to the wing 4 except at the channel groove 11 which will not adhere,

The flat blank with double layer side wall portions is now ready to be folded at the proper portions to set up the box base or cover. As indicated in Fig. 4 which shows enlarged the upper right-hand corner of the blank of Fig. 3, the blank is set up into completed form by first folding along the scorings 3 of the side wings 6- followed by'the inward folding of the attached extensions 8 and 9 on the now contiguous scorings 10 and 11. When this takes place, the crease 11, because of its initial convexity, bulges inwardly in alignment with and opposite the inside corner of the outer layer thus moving away from the corner area between the scorings 10 and removing the surplus material around which the outer layer is required to bend, thereby relieving the tensile strain on the outer layer of the box cover.

By the provision of the slotted portion 13 which by the initial double layer side wall forming operation extends along the exposed edge of the side wall as shown, I enable the layer 8 to yield or slide a slight distance relative to the layer 9, particularly at the top near the crease. I have found that even though the layers 8 and 9 are joined both by the paste strip 20 and also integrally at the scored portion 14, yet there tunity for. a limited sliding motion at and near the slit 13 which produces a slight bulge between the layers 8 and 9. It will be noted that as the slit 13 crosses the line of the crease on which the layers 8 and 9 are folded, and continues through the corner to the point 12, there is complete freedom for movement at the small portion where the crease formed by bending on the scoring 5 is again bent on itself when the layers 8 and 9 are turned in along the crease 10. As cracks are frequerrtly initiated at this point of high strain, the provision of the slit 13 at that portion is particularly effective to prevent the formation of cracks. In this manner I have provided a still further means for relieving the tension on the outer layer 8 and so effectively insure against splitting or cracking of the corner that the end portions 8 and 9 could be bent even a full 180 without any tendency to give in the corner.

Following the bending-in of the extension as shown in Fig. 4, the end wings 16 with their flaps 18 are folded as shown along the respective scorings 15 and 1'7 so that the end wings 16 come into face-to-face contact with the extensions 8 and the end wing flaps 18 come into face-to-face contact with the extensions 9, a suitable adhesive being applied and the layers forming the end wall being pressed together as well known in the art. Fig. 5 illustrates the completely formed corner and it will be found in practice that a box cover constructed as described is capable of withstanding the hard usage to which boxes such as shoe-boxes are subjected by being roughly pulled from a stock of boxes by the clerk's pulling on the end wall of the cover. The invention is of equal applicability and use both for the box proper and box cover before mentiond and serves the same purpose to prevent the crack ng 9;

is oppor- 1,956,124 the plane of the paper as viewed in Fig. 1) and breaking out of the corners by reason of relieving the strains on said exterior corner areas.

Having described my invention, what I wish to claim and secure by Letters Patent is:

1. As an article of manufacture, a box structure having a substantially plane central portion bounded at opposite edges by side walls approximately perpendicular to the central portion, each of said side walls comprising two layers of material secured together, a double layer end extension on each of said side walls adapted to be bent inwardly to form the corner between an end and side wall of the box structure the inner layer having an inwardly bulging corner crease aligned with and opposite the inside corner portion of the outer layer thereby providing a corner relieving portion for said outer layer.

2. As an article of manufacture, a box structure having a substantially plane central portion bounded at opposite edges by side walls approximately perpendicular to the central portion, each of said side walls comprising a double layer of material formed by folding a marginal portion of the material on itself to form the exposed edge of the side wall, a double layer end extension on each of said side walls adapted to be bent inwardly to form the corner between an end and side wall of the box structure, the inner layer having an inwardly bulging corner crease aligned with and opposite the inside corner portion of the outer layer thereby providing a corner relieving portion for said outer layer.

3. As an article of manufacture, a box structure having a substantially plane central portion bounded at opposite edges by side walls approximately perpendicular to the central portion, each of said side walls comprising a double layer of material formed by folding on itself and adhering together a marginal portion of the material to form the exposed edge of the side wall, a double layer end extension on each of said side walls adapted to be bent inwardly to form the corner between an end and side wall of the box structure, the inner layer having a nonadhering inwardly bulging comer crease aligned with and opposite the inside corner portion of the outer layer thereby providing a comer relieving portion for said outer layer.

4. As an article of manufacture, a box structure having a substantially plane central portion bounded at opposite edges by side walls approximately perpendicular to the central portion, each of said side walls comprising a double layer of material formed by folding a marginal portion of the material on itself to form the exposed edge of the side wall, a double layer end extension on each of said side walls, adapted to be bent inwardly to form the corner between an end and side wall of the box structure, said layers being disconnected by a slit extending from the corner along a portion only of the said exposed edge longitudinally of the end wall whereby the layers forming the end wall may have a slight relative movement at and near the corner-during the corner folding operation.

5. As an article of manufacture, a box structure having"'a;"substantially plane central portion bounded at opposite edges by side walls approximately perpendicular tothe central portion, each of said sidewalls comprising a double layer of material formed by folding a marginal portion of the material on itself to form the exposed edge of the side wall, adoifible layer end extension on each of said side walls adapted to be bent inwardly to form'the corner between an end and side wall of thebox structure, said layers being disconnected by a slit extending along a portion of the said exposed edge from the corner longitudinally of the end wall whereby the layers forming the end wall may have a slight relative movement at and near the corner during the eorner folding operation and the inner layble layer of material formed by folding a marginal portion of the material on itself to form the exposed edge of the side wall, a double layer end extension on each of said side walls adapted to be bent inwardly to form the comer between an end and side wall of the box structure, said layers being disconnected by a slit extending from the corner along a portion only of the said exposed edge longitudinally of the end wall whereby the layers forming the end wall may have a slight relative movement at and near the corner during the corner folding operation and the inner layer having an inwardly bulging corner crease-aligned with and opposite the inside corner portion of the outer layer thereby providing "a corner relieving portion for said outer layer.

WiLLIAM B. JACKSON.

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